officer jace son van dyke has pleaded not guilty to first degree murder. police initially said mcdonald had lunged at the officer with a knife. the video io shows he was walking when van dyke opened fire. >>> we are waiting to learn whether the texas 18-year-old serving probation for killing four people in a drunk driving juvenile detention center to an adult jail. ethan couch was brought back to texas yesterday from mexico. that is where authorities believe he and his mom fled after a party video was posted on the internet that showed couch may have been violating his probation. couch's mom was returned to texas last month. >>> federal health regulators are working to deter blood donation travels are who have visited one of the regions where the zika virus is present. the food and drug administering as the goal is to protect the u.s. blood supply. the virus has been linked to babies being born with abnormally small heads. >>> in bras i'll, researchers are releasing genetically modified mosquitos in an attempt to stopped spread of zika. scientists inserted